Method of attaching soles to shoes



Dec. 21, 1943. i s ;lf-lNN n 2,337,092

i 'METHOD OF ATTACHING SOLES TO SHOES FiledDc. 15, 1941 i 5 Sheets-Sheet 1 Dec. 21, 1943. s. J. FINN METHOD OF ATTACHING SOLES TO SHOES Filed Dec. 13, 1941 3 Sheets-Sheet 2 Figi Dee. 21, 1943. s. J. FINN 2,337,092

METHOD OF ATTACHING SOLES TO SHOES y VEA/TU@ Patented Dec. 21, 1943 METHOD' OF ATTACHING VSiLES TO SHOES Sidney J. Finn, Beverly, Mass., as signor to United Shoe MachineryCorporation, Flemington, N, 'J., a corporation vof -New Jersey Application December 13, 1941, SerialNo. 422,808

13 Claims.

This invention relates to methods foruse in cement-attaching soles to shoes and particularly Ato methods for obtaining close shanks.

It will be understood that, when soles 4are to be cement-attached to shoes by means of pres.- `sure-responsive cement, if the forepart of .the `sole is located with respect to the forepart of the shoe and then the heel part of the sole located Ywith respect to the heel-seat of the shoe, `the shank portion of the sole willbridge across the curve of the shank, and the 'length of the sole from the ball to the heel-seat will be less than the distance measured along the curve of the shank. Consequently, when the shank portion of the sole isforced against the shank ofthe shoe the material of the sole has to stretch in order to equal in length the curve of the shank. This, of course, puts a longitudinal tension on the shank portion of the sole which tends to cause it to pull away from the shank of the shoe,

a condition which militates against the Vproduction of shoes having permanently close Shanks.

Objects of this invention are to provide a method whereby the above disadvantageous conditions may be overcome by assuring that afsuiii- `this operation being usually referred to asspot ting the sole. The shank portion of the sole is then bent away from the shank portion of the shoe and the heel end of the sole spotted lupon "the heel-seat of the shoe.

The distance that the sole is separated from the shank will be sufficient to provide a -length measured along the sole which Vwill correspond to or slightly exceed the length 4measuredalong 'the curve of the shank between the 'respective Lcontact points of the sole and shoe. For this purpose the illustrated apparatus is 'provided which comprises a pair of fingers relativelymovable heightwise of the shoe and adapted, when in proximity to each other, to be located between .the vshoe and sole at the shank portion, the lingers being separable a predetermined vamount which may be varied for different shoes. The

4illustrated apparatus is disclosed and claimed The forepart of the vsole is located, for

perse in Vmy application, Serial No. 470.189.. Yled December 126, 1942as a division of this appl-ication. The Anext lstep is ,to apply pressure to the forepart .and heel portion .of the shoe Without ldisturbing the outward or Ydownward curva-ture ,of the shank portion. This virisuies Sllh adhesion atthe toe land heel ofthe `shoe that 4the sole cannot slip withrespect to the shoe. Nowthe shank portion ,of the sole is 4forced xagainst the shank portion of the shoe Vand uniform pressure is applied .t0 the .entire shoe bottom,

These pressure-applyinggsteps may be carried Vout by means of l:the illustrated apparatus which is disclosed and claimed perse ininyapplication, `Serial No. .470,1881"1ledfDecember 26, 11.942, as a division .of this application, -and Iwhich comprises a resilient pad to receive the sole of the shoe, the shank portion of .the pad being normally Ibent away from the shoe suiciently to accommodate the outwardly bulging shank portion `.of `the sole. The apparatus is provided with abutments engaging `the forepart-of theshoe andthe heel end of the last which areoperated to apply predeterminedpressure to the shoe, thus firmly seating .the forepart and heel-seat of the sole against y.the shoe to cause adhesion. After this pressure has been applied, means is provided :to Yforce the shank :portion of "the Vpad :up against 'the shank portion of the shoe .and then, Vby `means of an liniiatable bag covering the Aentire shoe bottom, the pad is yforced with uniform pressure against the `entire shoe bottom, thus insuring permanent cement-attachmentof -the shank portion as :well as the remainder ,of the sole in close-fitting relation to "the 'upper `of the shoe.

In the drawings,

Fig. 1 is asideelevation of `apparatus `designed `to effect a predetermined separation cfa `shoe and sole attheshank portion whilefthe end portions `of the shoeand `sole are-held by the operators fingers;

Fig. 2 is a sectional view on the line I-I-II of Fig. 7;

Fig. 3 vis a view similari-to Fig. 1the apparatus being shown `in inoperativeposition;

Fig. 4 is a 4plan view of the apparatus shown in Fig. 1;

Fig. 5 illustrates diagrammatically a cement sole attaching machine equipped with the present Vinvention Fig. 6 is a side-elevation, partly in section, .of 'the operating instrumentalitiesof acement sole attaching machine-equipped with the-presentin- 'vvention and responsive cement such as I2 is rigidly mounted or formed as an integral offset from a sleeve I8 fixed to a vertical shaft mounted for rotation in a bearing 22 formed in a bracket having an ear or ears such as 24 adapted to be secured to a suitable fixed support such, for example, as the left-hand side of a machine for pressing a shoe and sole together. The shaft 26 is held from upward movement by a washer 26 secured by a screw 28 to the-shaft. The lever I4 carrying the nger I0 is pivoted at 30 between ears 32 offset (Fig. 4.) from the sleeve IB which is carried by the shaft 20. Between its ends the lever I4 carries a Vertical slideway 34 in which the sliding block 36 is mounted. An adjusting screw 38 is threaded into the upper part of the slideway in position to engage the block 36 and limit its upward movement with respect to the lever I4. To the block 36 is pivoted one end of a link 0. A lever having three arms 42, 44 and d6 is pivoted at 66 to the finger arm I6, the lever arm 42 having ears between which the lower end of the link i0 is pivoted. A pin on the lever arm 46 is connected by a tension spring 50 to a pin on the nger arm I6, the spring holding the link 40 and the arm 2 in the angular position shown in Fig. 3 with the fingers I0, I2 together.

In the bearing 22 is formed a vertical slideway in which is fitted a slide 52 connected at 54 (Fig. 1) to a treadle rod 56. The Slide 52 carries a roll 58 which engages an inclined slot 66 in the sleeve IB so arranged that upward movement of the slide will swing the sleeve and the lingers which it carries about the axis of the shaft 20 from right to left. The upper portionv of the slot 60 is vertical and when the roll 58 reaches lthis portion of the slot rotation of the fingers .creases and a lateral projection 62 (Fig. 4) carried by the slide 52 engages a roll 66 on the lever .arm44. vFurther upward movement of the slide lthen straightens the toggle formed by the link 60 and the arm 42. The block 36 is thus raised and,

after engaging the screw 36, separates the iingers lIll, I2, by swinging the finger lever vIll about its iaxis 30, a predetermined amount, depending on the setting of the screw, upward movement of the slide 52 being limited by engagement of the roll 56 with the upper end of the slot 60.

In practising the present method, a lasted shoe S (Fig. 1) and an outsole O are prepared for `cement attachment by coating the overlasted portion of the upper and the marginal portion of jthe attaching face of the sole, including the heelseat portion of the shoe and sole, with pressurethe polymerzed chloroprene cement disclosed .in United States ,Letters Patent No. 2,061,296, granted November 16, 1936, on application of Walter H. Wedger, the cement being allowed to dry until it is in such condition that the shoe and sole will stick together when brought into contact. The operator portion of the sole somewhat separated from the shoe, depresses a treadle connected with the slide 52, causing it to move upwardly, thus swinging the fingers I0, I2 into position between the shoe and sole. Further movement of the treadle causes the fingers to separate a predetermined amount, depending on the setting of the screw 38. The rear end of the sole is then pressed against the heel-seat of the shoe, as shown in Fig. 1, the amount of separation of the ngers being so adjusted that the distance measured along the sole from the point of Contact with the shoe at the ball to the point of contact with the shoe at the heel end will be at least equal to, and may exceed, the distance measured between these points along the shoe bottom. If the length of the shank portion of the sole exceeds the length measured on the shoe against which it is to be laid, the act of forcing the bulged portion of the sole against the shank will place that portion under endwise compression so that it will tend to lie all the more iirmly against the shank of the shoe.

The shoe is now ready for treatment by a sole pressing machine having a novel type of pad box, which will now be described.

The general` organization of the machine, which may in most respects be similar to that disclosed in United States Letters Patent N o. 2,301,- 205, granted November l0, 1942, on my application, is shown diagrammatically in Fig. 5. The machine is provided with a novel pad box construction shown in Figs. 2, 6 and 7.

The pad box has a fixed forepart portion 'I0 secured to a frame l2 and an adjustable heel portion 'I4 which rests on a block 16 pivoted to a lever 18. The lever is U-shaped, its ends being fulcrumed at on the frame l2, and its forward end, which forms the loop of the U, rests on a slide 82 which is mounted in a bracket 86 secured to the frame l2. The slide 32 is arranged for upward and outward movement and is held against downward movement by a pawl 86 engaging teeth 88 on the front side of the slide. The pawl vf1.6 is held in engagement with the teeth 63 by a spring 90 and has a linger-piece S2 by which it may be released so that the operator, by grasping a handle 94, may move the slide and the foryWard end of the lever 'I8 up and down. The end of the heel portion 74 of the pad box next to the shankris connected at each side to a branch of the U-shaped lever i8 by a link 96, as is best shown in Fig. 2. Movement of the slide 82, therefore, will adjust the rear part 'I4 of the pad box relatively to its forepart to adapt the pad for shoes that are designed to receive heels of diierent heights, that is, for the spring of the last.

Between the rear part 74 and the forepart l0 of the pad box is a shank portion or plate 98 which is arranged. to move vertically into and out of position to ll the space between them. In the pad box is a solid rubber pad |00, and an inatable pad 102 is arranged beneath the pad |00 and connected with a pipe Ili through which iuid under pressure may be supplied to inflate the pad.

lThe shank portions of both pads |00 and |02 are preferably so formed that they normally project downwardly between the heel part and the forepart of the pad toward the shank plate 98. Extending downwardly at each side of the pad box is a plate |06. The upper corners of each plate are pivoted respectively to the heel part 14 at |08 and to the forepart 'I0 at Ilil (Fig. 7), the plates thus forming links between the forepart l0 and the heel part 74. The plates |06 extend down between the branches of the U-shaped lever 'I8 (Fig.

2) and are spaced apart suiciently to permit movement of the shank plate 98 between them. Projecting from each side of the shank plate 93 is a pin ||2 guided in a slot ||4 provided in one of the plates |06, the slots being perpendicular to a plane joining the pivots |08, H0. On the under side of the end of the plate 98 next to the forepart l are biiurcated ears ||6 to which the upper ends of toggle links ||0 are pivoted by pins |20. The lower ends of the links 8 are each pivoted by a rod |22 to bifurcated ears |24 formed on a number |26 which constitutes the lower links of a double toggle of which H0, ||'8 form the upper links. The member |26 has at each side an ear |28 which is pivoted by a pin |30 to one of the plates |06. Rearwardly of the double toggle H0, |26 is another pair of similar toggles the upper links |62 of which are pivoted at |34 (Fig. 7) to the shank plate 93 and the lower links |36 of which are pivoted at |38 one to each of the plates |06. The joint of the double toggle |32, |36 is formed by a rod |46 which passes through the adjacent ends of both pairs of links |32, |36 and is connected by a tension spring |42 to the block 16, the spring tending to break the toggle in a forward direction. The rod |40 forming the joint of the forward toggles is connected by links |44 to the rod |22 which forms the joint of the rearward toggles i8, |26. The links |44 cause the forward and rearward toggles to act in unison and, when straightened, to effect upward movement of the shank plate into the gap between the adjacent ends of the forepart 'i0 and the heel part 'I4 of the pad box.

Since the upper corners of each plate |06 are pivoted one at |06 to the heel part i4 and the other at H0 to the forepart '|0, these plates partake of the heightwise adjustment of the heel part 14 to accommodate lasts of different spring, and the shank plate 06, since it is carried by the plates |06 and is guided by the pinsl i2 in the slots l |4 which extend perpendicular to a line joining the pivots |03, i l0, will always be moved by operation of the toggles in a direction perpendicular to the shank portion of the pad, that is, perpendicular to a line joining the pivots |00, I l0.

In the middle of the member |26 (Fig. 2) is a pair of ears |46 between which is a rack bar |40 and through which and the rack bar the rod |22 passes, the rack bar being moved longitudinally when the toggles are operated. Teeth |50 on the rack bar (Figs. 6 and '7) engages a pinion |52 secured to the stem of a rotary valve |54 in the pipe |04, the arrangement being such that when the toggles are nearly straight the valve will be opened. A guide ist for the rack Hi8 is pivoted on the valve stern and serves to hold the rack in engagement with the pinion |52. y

rihe member |26 has a lateral extension |56 carrying a roll |50 upward pressure on which will straighten the toggles and raise the plate 98 as above explained. Beneath the roll |50 is a flat plate |60 extending lengthwise of the pad box and narrow enough to pass between the lower pivots of the toggles to engage the roll |58. The plate '|00 is carried by a fluid-operated plunger |62 mounted in a cylindrical recess |64 in the bracket 84 and held from turning by a pin |66 .on the plate |60, the pin sliding in a vertical hole in the bracket. The lower end of the cylinder |64 communicates with a pipe |68 through which fluid under pressure may be supplied to operate the plunger.

Referring now to Fig. 5, the shoe, with its sole located at the forepart and heel and with its shank portion bent away from the shoe a predetermined amount, as may be done for example by the separation of the iingers i0, I2, is placed upon the pad |00 with the shank portion of its sole occupying the depression in the shank portion of the pad. In the base of the machine is an oil reservoir |10 from which a rotary pump |12 supplies oil to a pipe |74 leading to a slide valve |76 at a pressure determined by a pressure control valve |28. Overiiow from this valve is led to another pressure control valve |60 which supplies oil at a lower pressure to a pipe |82 leading to a slide valve |34. The slide valve |76 is connected by a link `i 86 to a treadle |86 pivoted at |96. When the treadle |68 is depressed to lift the valve H6, oil is admitted under high pressure to a cylinder |62, causing a plunger |04 in the cylinder to push up on a rod i which is pivoted to the mid portion of a lever |98 fulcrurned at 200 to a earn 2il2 having a iixed pivot at 204. A pin 206 on the end of the lever opposite its fulcrum is connected by a strong tension spring 208 to a xed pin 2 i Upward movement of the rod |96 acts at rst to turn the cam 202 which, acting on a block 2|?, turns a lever 2|@ pivoted at 2|6 counterclockwise to cause abutments 2|0, 220 carried thereby to engage respectively the last and the forepart of the shoe and to press the shoe down upon the pad, thus applying pressure to the forepart and heel part of the shoe but not to the shank portion which is at this time unsupported, the shank portion of the sole lying in the depression in the shank portion of the pad |00. When a pressure determined by the tension on the spring 200 has been applied to the shoe, the spring yields, allowing the lever |66 to turn on its fulcrurn 250 and lift a link 222 which is pivoted at its lower end to an intermediate portion of a lever 224 fulcrumed at 226. The opposite end of the lever 224 is connected to the valve |33 which is lifted by the lever to open the valve, thus admitting oil from the pipe i232 at reduced pressure to the pipe les connected to the cylinder |64. The pipe i553 has a branch leading to a cylinder 23d in which is a double piston 232. The lower end of the cylinder receives oil under pressure from the pipe 223, and the upper portion of the cylinder is filled with water including the pipe iilll which leads to the inflatable pad |02.

When the slide valve i854 is opened as described, pressure will be delivered to the pipe |68 to cause the plunger |62 to rise and engage the roll |58, causing the toggles to straighten and the shank plate |93 to move into the gap between the forepart 'l0 and the heel part '|12- of the pad box. Just before the toggles EES, |26 reach their straightened position, the valve |515 in the pipe |04 will be opened by the action of the rack bar |40 on the pinion |52, thus permitting the pressure in the pipe 220 to act on the piston 232. and force water through the pipe |04 into the inflatable pad |02 whereby uniform pressure is applied to the entire shoe bottom. The toggles supporting the shank plate 98 become fully straightened before any substantial pressure is built up in the iniiatable pad and serve to support the shank plate rigidly while the shoe is under pressure.

To bridge any gap which may occur between the shank plate 98 and the heel part 'itl of the box, a thin plate 23d (Fig. '7) is pivoted at 236 to the heel part 14 of the box and at its opposite edge overlies the adjacent edge of the vshank plate 98.

Having thus described my invention, what -I claim as new and desire to secure by Letters Patent of the United States is:

1. rlhat improvement in methods of attaching soles to shoes which consists in holding the shank portion of the sole bulged away from the shank portion of the shoe, and while the shank portion is so held applying pressure to the shank portion of the sole to cause the outwardly bulged portion to engage the shank portion of the shoe.

2. That improvement in methods of attaching soles to shoes which consists in pressing the end portions of the sole against the shoe bottom while the shank portion of the sole is bulged outwardly with respect to the shank portion of the shoe, applying pressure to the shank portion of the sole to cause the outwardly bulged portion to engage the shank portion of the shoe, and then applying uniform pressure to the entire shoe bottom.

3. That improvement in methods of attaching soles to shoes which consists in spotting the sole at one end portion of the shoe, bending the shank portion away from the shank portion of the shoe, spotting the opposite end portion of the sole on the shoe bottom, and applying pressure rst to the -end portions of the shoe and then to the shank portion.

4. That improvement in methods of attaching soles to shoes which consists in spotting the sole at one end portion of the shoe, bending the shank portion away from the shank portion of the shoe, spotting the opposite end portion of the sole on the shoe bottom, and applying pressure rst to the end portions of the shoe, then to the shank portion, and finally applying uniform pressure to the entire shoe bottom.

5. That improvement in methods of attaching soles to shoes which consists in providing pressure-responsive cement on the attaching faces of a shoe and sole, locating the forepart of the sole with respect to the forepart of the shoe, causing them to adhere, separating the shank portion of the sole from the shank portion of the shoe a predetermined distance, locating the heel part of the sole with respect to the heel-seat of the shoe, causing it to adhere, applying pressure to the forepart and heel part of the shoe, forcing the shank portion of the sole against the shank portion of the shoe, and then applying pressure to the entire sole area.

6. That improvement in methods of attaching soles which consists in providing pressure-responsive cement on the attaching faces of a shoe and sole, locating the forepart of the sole with respect to the forepart of the shoe, causing them to adhere, separating the shank portion of the sole from the shank portion of the shoe, locating the heel part of the sole with respect to the heelseat of the shoe, causing it to adhere, applying pressure to the forepart and heel part of the shoe, forcing the shank portion of the sole against the shank portion of the shoe, and then applying uniform pressure to the entire sole area.

7. That improvement in methods of attaching soles to shoes which consists in pressing the toe portion of a sole against a shoe bottom, locating the shank portion of the sole away from the shank portion of the shoe, while the shank portion is so located pressing the rear end of the sole against the heel-seat of the shoe, 'and then applying pressure to the shank portion of the sole to cause it to engage the shank portion of the shoe.

8. That improvement in methods of attaching soles to shoes which consists in pressing the end portions of a `sole having pressure-responsive cement thereon against the end portions of a shoe bottom while the shank portion of the sole is bulged outwardly with respect to the shank portion of the shoe to an extent such that the distance measured along the sole between the contact points of the shoe and sole will substantially equal the distance measured along the shoe bottom between said points, applying pressure to the shank portion of the sole to cause the outwardly bulged portion to engage the shank portion of the shoe, and then applying pressure to the entire shoe bottom.

9. That improvement in methods of attaching soles to shoes which consists in bending the shank portion of a sole away from the shank portion of a shoe, while the sole is so bent pressing the forepart and the heel part of the sole against the shoe bottom, and then applying pressure to the shank portion of the sole to cause the outwardly bent portion to engage the shank portion of the shoe.

10. That improvement in methods of attaching soles to shoes which consists in pressing the end portions of a sole having pressure-responsive cement on its attaching faces against a similarly cemented shoe bottom, While the shank portion of the sole is bulged outwardly with respect to the shank portion of the shoe applying pressure to the shank portion of the sole to cause the outwardly bulged portion to adhere to the shank portion of the shoe, and then applying uniform pressure to the entire shoe bottom.

1l. That improvement in methods of attaching soles to shoes which consists in preparing a sole with polymerized chloroprene cement on the margin of its attaching face in condition to adhere under pressure to a similarly prepared surface on a shoe, spotting the sole at one end portion of the shoe bottom, bending the shank portion away from the shank portion of the shoe, spotting the opposite end portion of the sole on the shoe bottom, and applying pressure first to the end portions of the shoe and then to the shank portion.

12. That improvement in methods of attaching soles to shoes which consists in providing pressure-responsive cement on the attaching faces of a shoe and sole, locating the forepart of the sole with respect to the forepart of the shoe, causing them to adhere, separating the shank portion of the sole from the shank portion of the shoe a, predetermined distance, locating the heel part of the sole with respect to the heelseat of the shoe, causing them to adhere, applying pressure to the forepart and heel part of the shoe without disturbing the outwardly bulged position of the shank part of the sole, then forcing the shank portion of the sole against the shank portion of the shoe, and applying uniform pressure to the sole.

13. That improvement in methods of attaching soles to shoes which consists in providing pressure-responsive cement on the attaching face/ of a shoe and sole, spotting the forepart of the sole upon the forepart of the shoe, separating the central portion of the shank of the sole from the central portion of the shank of the shoe a predetermined distance, spotting the rear part of the sole upon the heel-seat of the shoe whereby the shank portion of the sole is in outwardly bulged relation to the shank of the shoe, forcing the outwardly bulged shank portion of the sole against the shank portion of the shoe, and applying uniform pressure to the sole.

SDDNEY J. FINN. 

